FI91469C - Method of tuning an RF bandpass filter - Google Patents
Method of tuning an RF bandpass filter Download PDFInfo
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- FI91469C FI91469C FI921412A FI921412A FI91469C FI 91469 C FI91469 C FI 91469C FI 921412 A FI921412 A FI 921412A FI 921412 A FI921412 A FI 921412A FI 91469 C FI91469 C FI 91469C
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- filter
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- bandpass filter
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000001902 propagating effect Effects 0.000 claims abstract 4
- 239000002131 composite material Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 2
- 239000000969 carrier Substances 0.000 claims 1
- 238000001228 spectrum Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002716 delivery method Methods 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0058—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means
- H03J1/0066—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means with means for analysing the received signal strength
- H03J1/0075—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means with means for analysing the received signal strength where the receiving frequencies of the stations are stored in a permanent memory, e.g. ROM
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H7/468—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source particularly adapted as coupling circuit between transmitters and antennas
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Networks Using Active Elements (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Filters And Equalizers (AREA)
- Transmitters (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
- Radar Systems Or Details Thereof (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
i 91469i 91469
Menetelmå RF-kaistanpååstosuodattimen virittåmiseksi 5 Keksinnon kohteena on oheisten patenttivaatimusten 1 ja 3 johdanto-osien mukaiset menetelmat RF-kaistanpåås-tosuodattimen virittåmiseksi.The invention relates to methods for tuning an RF bandpass filter according to the preambles of the appended claims 1 and 3.
Keksinnon mukaiset menetelmat on tarkoitettu kay-tettaviksi erityisesti GSM- tai vastaavan matkapuhelin-10 verkon ns. kompainerisuodattimien virityksessa, mutta niita voidaan soveltaa myos muihin tarkoituksiin soveltu-vissa kaistanpååstosuodattimissa, joissa taajuudensåådosså tarvitaan taajuusselektiivistå tehonmittausta.The methods according to the invention are intended to be used in particular in the so-called GSM or similar mobile telephone-10 network. in the tuning of combiner filters, but they can also be applied to bandpass filters suitable for other purposes, where frequency-selective power measurement is required for frequency control.
Kompaineri on laite, jolla kytketaan monta låhetintå 15 samaan antenniin tai antennilinjaan. Talloin on kukin radiolåhetin kytketty oman kaistanpååstosuodattimensa, ns. kompainerisuodattimen kautta antenniin tai antennilinjaan. Jokaisen kaistanpaåstosuodattimen keskitaajuus on viritet-ty sita vastaavan radiolahettimen keskitaajuudelle. Suo-20 dattimien tehtSvånM on toisaalta syottSå oman radiolShet-timenså lahetyssignaali mahdollisimman pienin hSvidin antenniin ja toisaalta mahdollisimman tehokkaasti eståå muiden radiolShettimien eri taajuisten lMhetyssignaalien paasy antennin suunnasta omalle radiolShettimelle. Perin-25 teisesti kompainerisuodattimet on viritetty kiinteasti radiolMhettimien lahetystaajuuksille. Tålloin radiolahettimen IShetystaajuutta ei ole voitu muuttaa muuttamatta samalla kompainerisuodatinta tai sen viritysta.A combiner is a device that connects multiple transmitters 15 to the same antenna or antenna line. In this case, each radio transmitter is connected to its own bandpass filter, the so-called through a combiner filter to the antenna or antenna line. The center frequency of each bandpass filter is tuned to the center frequency of the corresponding radio transmitter. The purpose of the Suo-20 data is, on the one hand, to feed the transmission signal to the smallest hSvid antenna in its own radio transmitter and, on the other hand, to prevent the transmission of signals of different frequencies from other radio transmitters from the antenna direction to its own radio transmitter. Traditionally, combiner filters are fixedly tuned to the transmission frequencies of radio transmitters. In this case, the transmission frequency of the radio transmitter could not be changed without changing the combiner filter or its tuning.
Usein on kuitenkin toivottavaa voida muuttaa ra-30 diolahettimien taajuuksia yksinkertaisesti ja nopeasti. Tallainen tapaus on esimerkiksi solukkotyyppisen matka-puhelinjårjestelmSn tukiasema, jolle on nimetty tietyt lahetys- ja vastaanottokanavat. Mikali jarjestelmån kana-vajakoa voidaan haluttaessa muuttaa muuttamalla tukiasemi-35 en IShetys- ja vastaanottotaajuuksia, on mahdollista kayt- 2 tåå joustavasti ja tehokkaasti hyvåksi jårjestelmån kanavakapasiteettia muuttuvissa olosuhteissa. Taman vuoksi on kehitetty kompainerisuodattimia, joiden keskitaajuus muuttuu automaattisesti lahetystaajuuden muuttuessa.However, it is often desirable to be able to change the frequencies of ra-30 diol transmitters simply and quickly. Such a case is, for example, a base station of a cellular mobile telephone system to which certain transmission and reception channels have been assigned. If the channel deficiency of the system can be changed, if desired, by changing the transmission and reception frequencies of the base stations, it is possible to make flexible and efficient use of the channel capacity of the system in changing conditions. For this reason, combiner filters have been developed whose center frequency changes automatically as the transmission frequency changes.
5 NSiden automaattisesti viritettMvien kompainerisuo- dattimien sååto perustuu suodattimien sisåånmenosta hei-jastuvan RF-tehon tai kompainerisuodattimen lapi kulkevan RF-tehon mittaukseen. Suodattimen keskitaajuus lukitaan taajuuteen, jolla heijastuva teho on minimissaan tai ete-10 nevå teho maksimissaan.5 The setting of the automatically tuned combiner filters is based on the measurement of the RF power reflected from the input of the filters or the RF power passing through the combiner filter. The center frequency of the filter is locked to the frequency at which the reflected power is at a minimum or the forward power is at a maximum.
GSM- ja PCN-matkapuhelinverkoissa kåytetåån lahetin-signaalin modulaatiomenetelmånå ns. GMSK (Gaussian Minimum Shift Keying) -modulaatiota. Tama modu1aatiomenetelma on kåytånndn olosuhteita vastaavilla signaaleilla suhteelli-15 sen laajakaistainen, mika aiheuttaa sen, etta kompainerisuodattimia on vaikea virittåå oikealle taajuudelle, ja saavutettu sååtotarkkuus jaå melko vaatimattomaksi.In GSM and PCN mobile telephone networks, the so-called transmitter signal modulation method is used. GMSK (Gaussian Minimum Shift Keying) modulation. This method of modulation is relatively wideband with signals corresponding to the operating conditions, which makes it difficult to tune the combiner filters to the correct frequency, and the output accuracy obtained is rather modest.
Esillå olevan keksinnon tarkoituksena onkin saada aikaan menetelmå, jonka avulla kompainerisuodattimet voi-20 daan virittåå entistå tarkemmin oikealle taajuudelle. Tåmå saavutetaan keksinnon ensimmåisen suoritusmuodon mukaisel-la menetelmållå, jolle on tunnusomaista se, mitå kuvataan oheisen patenttivaatimuksen l tunnusmerkkiosassa, tai keksinnon toisen suoritusmuodon mukaisella menetelmållå, .25 jolle on tunnusomaista se, mitå kuvataan oheisen patenttivaatimuksen 3 tunnusmerkkiosassa.The object of the present invention is therefore to provide a method by means of which the combiner filters can be tuned even more precisely to the correct frequency. This is achieved by a method according to a first embodiment of the invention, characterized by what is described in the characterizing part of appended claim 1, or by a method according to a second embodiment of the invention, characterized by what is described in the characterizing part of appended claim 3.
Keksinnon mukaisena perusajatuksena on hakea kais-tanpååstosuodattimelle se keskitaajuus, jolla suodattimen låpi etenevå teho on maksimissaan tai suodattimen sisåån-30 menosta heijastuva teho minimissåån (ainakin) kahteen kertaan kåyttåen kummallakin kerralla sellaista moduloivaa signaalia, joka aikaansaa modulaatiotuloksena saatavan signaalin spektriin teråvån piikin (kantoaallon) ennalta mååråtylle taajuudelle, ja mååratå lopullinen taajuus .35 nåiden RF-taajuisten signaalien perusteella suoritetuista 91469 3 virityksista saadun (ainakin) kahden viritysarvon perus-teella.The basic idea according to the invention is to find for the bandpass filter the center frequency at which the power passing through the filter is at its maximum or the power reflected from the inlet of the filter at least (at least) twice using the modulus to a predetermined frequency, and determine the final frequency.35 Based on (at least) two excitation values obtained from 91469 3 tunings performed on these RF signals.
Keksinnon mukaisella ratkaisulla saadaan RF-kaistan-paastosuodatin viritettya entistS helpommin ja tarkemmin 5 oikealle taajuudelle.With the solution according to the invention, it is possible to tune the RF band fast filter more easily and accurately to the correct frequency.
Seuraavassa keksintda ja sen edullisia suoritusmuo-toja selitetSSn tarkemmin viitaten oheisten piirustusten mukaisiin esimerkkeihin, joissa kuvio l esittaa lohkokaaviona tyypillista kompaine-10 risuodattimilla toteutettua lShetinjarjestelmSå, jossa kaistanpaastosuodattimen (kompainerisuodattimen) paSsto-kaistan keskitaajuutta saadetSSn suodattimen lapi etene-vSstM RF-tehosta riippuvaisesti, kuvio 2 esittaa lohkokaaviona tyypillista kompaine-15 risuodattimilla toteutettua lahetinjarjestelmaa, jossa kaistanpaastosuodattimen (kompainerisuodattimen) paastd-kaistan keskitaajuutta saadetaan suodattimen sisaanmenosta takaisin heijastuvasta RF-tehosta riippuvaisesti, kuvio 3 esittaa lohkokaaviona sinansa tunnettua 20 GMSK-modulaattoria, jota kaytetåan kuvioissa 1 ja 2 esite-tyissa lahettimissa, kuvio 4a esittaa tyypillista GMSK-modulaation spekt- ria, kuvio 4b esittaa keksinnon mukaisessa menetelmassa 25 kaytettavan ensimmaisen signaalin spektria, ja kuvio 4c keksinndn mukaisessa menetelmassa kaytettavan toisen signaalin spektria.In the following, the invention and its preferred embodiments will be explained in more detail with reference to the examples according to the accompanying drawings, in which Fig. 1 shows a block diagram of a typical composite filter system 2 shows a block diagram of a typical transmitter system implemented with comp 15-filter filters, in which the center frequency of the fast band of a bandpass filter (combiner filter) is obtained from the input of the filter in terms of the reflected RF power. in transmitters, Fig. 4a shows a typical GMSK modulation spectrum, Fig. 4b shows the spectrum of the first signal used in the method 25 according to the invention, and Fig. 4c shows the spectrum of the first signal used in the method according to the invention. a spectrum of the second signal to be used.
Kuviossa 1 on esitetty GSM- tai vastaavaan matkapu-helinverkkoon kuuluva radioiahetinjårjestelma, joka kasit-.30 taa n kappaletta radioiahettimia TX1, TX2...TXn, joilla on vastaavasti lahetystaajuudet fl, f2...fn, jotka ovat esi-merkiksi alueella 920-960 MHz. Kukin radioiahetin on kytketty vastaaville taajuuksille viritettyjen kaistan-paastosuodattimien I0lf 102. ·. 10n kautta yhteiseen summaus-55 pisteeseen SI ja edelleen suuntakytkinelimen 12 kautta 4 yhteiseen låhetysantenniin ANT. (Kunkin lahettimen kytken-tS kaistanpaastosuodattimelleen tapahtuu tåssa esimerkissa kiertoelimen 112, 112 ja vastaavasti lln kautta. Kiertoeli-met eivat kuitenkaan ole keksinnon kannalta valttamåttomi-5 å.) Låhetysantennille ANT syotettSva signaali sisaitMa siten kaikkien lMhettimien taajuudet. Kuviossa 1 esitetty-ja, useita lahettimia yhteiseen antenniin kytkevia kais-tanpaastdsuodattimia 102, 102...10n kutsutaan yleisesti kompainerisuodattimiksi.Figure 1 shows a radio transmitter system belonging to a GSM or similar mobile telephone network, which comprises n .30 radio transmitters TX1, TX2 ... TXn, respectively, having transmission frequencies f1, f2 ... fn, for example in the area 920 -960 MHz. Each radio transmitter is connected to band-fast filters I0lf 102 tuned to the corresponding frequencies. ·. 10n to a common summing-55 point SI and further via a directional switch member 12 to 4 common transmitting antennas ANT. (In this example, the switching of each transmitter to its band-pass filter takes place via the rotating means 112, 112 and 11, respectively. However, the rotating means are not indispensable to the invention.) The signal supplied to the transmitting antenna ANT thus includes the frequencies of all transmitters. The bandpass filters 102, 102 ... 10n shown in Figure 1, which connect a plurality of transmitters to a common antenna, are commonly referred to as combiner filters.
10 Radiolåhetinjarjestelma kasittaa lisaksi ohjausyksi- kon 13, joka ohjaa kuhunkin kompainerisuodattimeen kuulu-vaa askelmoottoria 14lf 142 ja vastaavasti 14n, joista kukin såataa oman kompainerisuodattimensa keskitaajuutta. Kukin suodatin on kapeakaistainen suodatin, jonka keski-15 taajuus pyritaan saMtamaan mahdollisimman lahelle lahetys-kantoaallon taajuutta niin, ettå lahetettava signaali siirtyy mahdollisimman pienin havidin antenniin ANT. Kuvi-on 1 esimerkissa keskitaajuutta saadetaan sinSnså tunne-tulla tavalla kaistanpaastosuodattimen lSpi etenevastå RF-20 tehosta riippuvaisesti. Suuntakytkimelia 12 otetaan kunkin suodattimen ulostulosignaalista erikseen naytesignaali PF, joka on verrannollinen ko. suodattimen iapi menneeseen lahetystaajuiseen signaalitehoon. Naytesignaali syotetaan ohjausyksikolle 13, joka saataa askelmoottorin avulla 25 suodattimen keskitaajuutta siten, etta nMytesignaalin taso on maksimissaan.The radio transmitter system further provides a control unit 13 which controls a stepper motor 14lf 142 and 14n, respectively, associated with each combiner filter, each of which encapsulates the center frequency of its own combiner filter. Each filter is a narrowband filter, the center frequency of which is sought to be as close as possible to the frequency of the transmission carrier, so that the signal to be transmitted is transmitted to the antenna ANT with the lowest possible frequency. In the example of Fig. 1, the center frequency is obtained in a manner known per se depending on the advancing RF-20 power of the bandpass filter 1Spi. The direction switch 12 is taken separately from the output signal of each filter as a sample signal PF, which is proportional to the to the past transmission frequency signal power of the filter. The sample signal is applied to a control unit 13 which, by means of a stepper motor 25, transmits the center frequency of the filter so that the level of the nMyte signal is at its maximum.
Kuvion 2 mukainen esimerkki vastaa muuten kuvion 1 suoritusmuotoa, mutta nyt kunkin kompainerisuodattimen 102♦.·10n viritys tapahtuu toisella sinansM tunnetulla 30 tavalla eli kompainerisuodattimen sisaanmenosta takaisin heijastuvasta RF-tehosta riippuvaisesti. Taman takia ei antennilinjassa ole suuntakytkinta, vaan kuhunkin lahetin-haaraan, kompainerisuodattimen sisaanmenoon, on kytketty oma suuntakytkinelimensa 122, 122 ja vastaavasti 12n. Tassa 35 tapauksessa otetaan kullakin suuntakytkimelia suodattimen 91469 5 sisaånmenosta heijastuvasta signaalikomponentista sen tehoon verrannollinen nSytesignaali PR, joka sydtetaan ohjausyksikolle 13. Ohjausyksikkd 13 sSStåå kunkin askel-moottorin avulla vastaavan suodattimen keskitaajuutta 5 siten, ettM naytesignaalin taso on minimissåån.The example according to Fig. 2 otherwise corresponds to the embodiment of Fig. 1, but now the tuning of each combiner filter 102 ♦ · 10n takes place in another known manner 30, i.e. depending on the RF power reflected back from the input of the combiner filter. For this reason, there is no directional switch in the antenna line, but a separate directional switch member 122, 122 and 12n, respectively, are connected to each transmitter branch, the input of the combiner filter. In this case 35, for each directional switch noise, a signal PR is proportional to the power reflected from the input of the filter 91469 5, proportional to its power, which is applied to the control unit 13. The control unit 13
Edellå on kuvattu ne kaksi tunnettua kompainerisuo-dattimen viritystapaa, joihin keksinnon mukainen menetelmå perustuu. Seuraavassa selitetåån tarkemmin keksinnon mu-kaisia menetelmåvaiheita.The two known methods of tuning the combiner filter on which the method according to the invention is based have been described above. The method steps according to the invention are explained in more detail below.
10 Kuviossa 3 on esitetty lohkokaaviona låhettimiin TXl...TXn kuuluva sinånsa tunnettu GMSK-modulaattori, ja kuvassa 4a puolestaan tyypillinen signaalispektri SI, joka saadaan GMSK-modulaation tuloksena. GMSK-modulaattori kasittaå koodausyksikon 31, Gaussin suodattimen 32, jolle 15 koodausyksikon ulostulo on kytketty ja modulointiyksikdn 33, jolle suodattimen ulostulo on kytketty. Koodausyksi-kossa suoritetaan sisåantulevan datan differentiaalinen koodaus, koodattu signaali suodatetaan Gaussin suodatti-messa 32 ja suodatettu signaali moduloidaan kantoaaltotaa-20 juudelle modulointiyksikossa 33. Koska GMSK-modulaattorin rakenne on sinånså tunnettu, eikM se liity varsinaiseen keksinndlliseen ajatukseen, ei sitS kuvata tåssS yhteydes-så. enempSa. Tarkemmin modulaattorin toiminta ilmenee esim. GSM-spesifikaation 05.04. (versio 3.1.1) kohdista 2.4-2.6.Fig. 3 shows a block diagram of a GMSK modulator belonging to the transmitters TX1 ... TXn, which is known per se, and Fig. 4a shows a typical signal spectrum S1 obtained as a result of GMSK modulation. The GMSK modulator provides a coding unit 31, a Gaussian filter 32 to which the output of the 15 coding units is connected, and a modulation unit 33 to which the output of the filter is connected. The encoding unit performs differential encoding of the incoming data, the encoded signal is filtered in a Gaussian filter 32, and the filtered signal is modulated to a carrier frequency in the modulation unit 33. Since the structure of the GMSK modulator is known per se, it is not related to the actual inventive idea. weather. enempSa. More specifically, the operation of the modulator is reflected, for example, in the GSM specification 05.04. (version 3.1.1) from sections 2.4-2.6.
25 Modulointiyksikon 33 ulostulosta saatavan ja kom- painerisuodattimelle sydtettåvan RF-taajuisen signaalin spektri SI on tyypillisesti kuviossa 4a esitetyn kaltai-nen, eli suhteellisen levea. Tålldin moduloivana datana on ollut kåytSnndn tilanteessa siirrettavå data tai satun-30 naisdata, joka muistuttaa kåytMnnon tilanteessa siirret-tavSa dataa.The spectrum S1 of the RF frequency signal output from the output of the modulation unit 33 and input to the computer filter is typically as shown in Figure 4a, i.e. relatively wide. The modulating data of the field has been data to be transmitted in use or random data, which resembles data to be transmitted in use.
GMSK-modulaatiolla on kuitenkin sellainen ominai-suus, ettå modulaatiotuloksena saatavan signaalin spekt-riin saadaan terSva piikki (kantoaalto) ennalta mSaratyl-35 le, varsinaisesta nimellisesta kantoaaltotaajuudesta fc (fc 6 on fl, f2 jne. tai fn) poikkeavalle taajuudelle, kun modu-loivana datana kåytetåån tiettyå ennalta maarattya bitti-jonoa. Toisin sanoen, kantoaalto esiintyykin teravana piikkina taajuudella, joka on siirtynyt ennalta mååratyn 5 måårån sivuun nimellisestå kantoaaltotaajuudesta. Esimer-klksi kMytettSessS bittijonoa 11111... siirtyy xnainittu spektripiikki nimellisestå kantoaaltotaajuudesta +(1/4T) :n verran sivuun, kun 1/T on kaytettMvå siirtonopeus (GSM-jarjestelmassa siirtonopeus on 270,833 kbit/s). Vastaavas-10 ti kaytettaessa bittijonoa 010101... siirtyy mainittu spektripiikki nimellisestå kantoaaltotaajuudesta -(1/4T) :n verran sivuun.However, GMSK modulation has the property that the spectrum of the signal resulting from the modulation results in a terSva peak (carrier) for a frequency different from the actual nominal carrier frequency fc (fc 6 is fl, f2, etc. or fn) when A specific predefined bit string is used as the smooth data. In other words, the carrier appears as a sharp peak at a frequency that has shifted by a predetermined 5 seconds from the nominal carrier frequency. As an example, the used bit string 11111 ... shifts the indicated spectrum peak from the nominal carrier frequency by + (1 / 4T) when 1 / T is the available transmission rate (in the GSM system, the transmission rate is 270.833 kbit / s). When the corresponding bit string 010101 ... is used, said spectral peak shifts from the nominal carrier frequency by - (1 / 4T).
Keksinndn mukaisesti tåtå ominaisuutta kåytetåån hyvaksi kompainerisuodattimien virityksesså siten, etta 15 ensin kantoaaltoa moduloidaan esim. bittijonolla 1111.., jota on esitetty kuviossa 3 viitemerkillM Al. Talloin on modulaattoriyksikosta 33 kompainerisuodattimen sisaanme-noon saatavan RF-taajuisen signaalin spektri S2 kuviossa 4b esitetyn kaltainen. Spektrisså on nyt terSvS piikki 20 (kantoaalto) taajuudella, joka on siirtynyt +Af:n (Δί=1/4Τ) verran sivuun nimellisestå kantoaaltotaajuudesta fc. TStS signaalia kåyttåen haetaan kompainerisuodattimelle se keskitaajuus, jolla suodattimen lapi eteneva teho on maksimissaan tai suodattimen sisMMnmenosta heijastuva teho 25 on minimissaSn, toisin sanoen kSytetSSn joko kuvion l tai 2 yhteydessci kuvattua menetelmaS. NSin saatu ensimmainen keskitaajuustieto talletetaan muistiin.According to the invention, this feature is exploited in the tuning of the combiner filters by first modulating the carrier, e.g. by a bit string 1111 .., which is shown in Fig. 3 by the reference symbol A1. In this case, the spectrum S2 of the RF frequency received from the modulator filter 33 at the input of the combiner filter is as shown in Fig. 4b. The spectrum now has a terSvS peak at 20 (carrier) at a frequency that has shifted by + Af (Δί = 1/4 sivu) aside from the nominal carrier frequency fc. Using the TStS signal, the center frequency at which the power passing through the filter is at its maximum or the power 25 reflected from the input of the filter is at a minimum is applied to the combiner filter, i.e. the method described in connection with either Figure 1 or 2 is used. The first center frequency information obtained by the NS is stored in memory.
Seuraavassa vaiheessa moduloidaan kantoaaltoa esim. bittijonolla 010101..., jota on merkitty kuviossa 3 viite-30 merkillM A2. Talloin on modulaattoriyksikostS kompainerisuodattimen sisaanmenoon saatavan RF-taajuisen signaalin spektri S3 kuviossa 4c esitetyn kaltainen. SpektrissM on nyt terava piikki (kantoaalto) taajuudella, joka on siirtynyt -Af:n (Af=l/4T) verran sivuun nimellisestå kantoaal-35 totaajuudesta fc. (KSytannossS sisaltSvSt modulaatiotulok- 91469 7 sena saatavat spektrit SI ja S2 heikompia komponentteja muillakin taajuuksilla, mutta selvyyden vuoksi niitå ei ole esitetty kuvioissa 4b ja 4c.) Tatå toista signaalia kSyttSen haetaan kompainerisuodattimelle jalleen se keski-' 5 taajuus, jolla suodattimen ISpi eteneva teho on maksimis- saan tai suodattimen sisåSnroenosta heijastuva teho on minimissaan, toisin sanoen kSytetåån uudelleen joko kuvion 1 tai 2 yhteydesså kuvattua menetelmaa. Nåin saatu toinen keskitaajuustieto talletetaan muistiin.In the next step, the carrier is modulated, e.g. with the bit string 010101 ..., which is denoted in Fig. 3 by reference numeral A2. The spectrum S3 of the RF frequency input from the modulator unit to the input of the combiner filter is then as shown in Fig. 4c. SpektrissM is now a sharp peak (carrier) at a frequency shifted by -Af (Af = 1 / 4T) aside from the nominal carrier-35 true frequency fc. (The spectra S1 and S2 resulting from the modulation result included in the use are weaker components at other frequencies as well, but for the sake of clarity they are not shown in Figures 4b and 4c.) is at its maximum or the power reflected from the filter inside the filter is at a minimum, i.e. the method described in connection with either Figure 1 or 2 is reused. The second center frequency information thus obtained is stored in memory.
10 Viimeisena vaiheena suoritetaan kompainerisuodatti- men lopullinen viritys virittamalla keskitaajuus ensimmai-sen ja toisen keskitaajuustiedon puolivaliin.As a final step, the final tuning of the combiner filter is performed by tuning the center frequency to halfway between the first and second center frequency information.
Vaikka keksintoa on edellS selostettu viitaten oheisten piirustusten mukaiseen esimerkkiin, on selvSå, 15 ettei keksinto ole rajoittunut siihen, vaan sita voidaan muunnella monin tavoin edella ja oheisissa patenttivaati-muksissa esitetyn keksinnollisen ajatuksen puitteissa.Although the invention has been described above with reference to the example according to the accompanying drawings, it is clear that the invention is not limited thereto, but can be modified in many ways within the scope of the inventive idea set forth above and in the appended claims.
Vaikka siis keksintoa on selitetty viitaten esim. GSM-jar jestelmaan kuuluvaan kompainerisuodattimeen, on keksin-20 t6 sovellettavissa muihinkin jarjestelmiin, joissa kayte-taan GMSK-modulaatiota, tai muidenkin sellaisten modulaa-tiomenetelmien yhteyteen, jotka omaavat vastaavat ominai-suudet. MenetelmS voidaan periaatteessa toteuttaa myos siten, etta kantoaaltotaajuuden ensimmåinen ja toinen 25 siirtymS ovat itseisarvoltaan eri suuruisia. Edella kuva-tussa esimerkissa tSmå tarkoittaa sita, etta vastaavissa menetelmavaiheissa kaytetaan erilaista siirtonopeutta.Thus, although the invention has been described with reference to, for example, a combiner filter belonging to the GSM system, the invention is applicable to other systems using GMSK modulation or to other modulation methods having similar properties. In principle, the method can also be implemented in such a way that the first and second shifts of the carrier frequency have different absolute values. In the example described above, tSmå means that a different baud rate is used in the corresponding process steps.
Menetelmat voidaan mybs yhdistaa siten, etta saadossa kSytetåån seka heijastuneen RF-tehon etta lapimenneen RF-30 tehon mittausta siten, etta ohjausyksikkb valitsee kulloi- senkin saatotavan ulkoisesta kuormituksesta riippuen.The methods can be combined in such a way that both the reflected RF power and the flattened RF-30 power measurement are used in the output, so that the control unit selects the respective delivery method depending on the external load.
Koska erilaiset kuormitustilanteet vaikuttavat eri tavoin nåytesignaaleihin Pp ja PR, voidaan talia yhdistetylla saatotavalla pienentaa naiden ulkoisten kuormitusten vai-35 kutusta såatoon.Since different load situations affect the sample signals Pp and PR in different ways, the effect of these external loads on the crop can be reduced by the combined escrow mode.
Claims (4)
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI921412A FI91469C (en) | 1992-03-31 | 1992-03-31 | Method of tuning an RF bandpass filter |
JP05517134A JP3078838B2 (en) | 1992-03-31 | 1993-03-30 | How to tune an RF bandpass filter |
AU37551/93A AU659303B2 (en) | 1992-03-31 | 1993-03-30 | A method for tuning an RF bandpass filter |
US08/150,132 US5448769A (en) | 1992-03-31 | 1993-03-30 | Method for tuning the medium frequency of an RF bandpass filter by determining and interpolating in relation to medium frequencies at and offsets from a nominal carrier frequency |
PCT/FI1993/000128 WO1993020616A1 (en) | 1992-03-31 | 1993-03-30 | A method for tuning an rf bandpass filter |
EP93921740A EP0587886B1 (en) | 1992-03-31 | 1993-03-30 | A method for tuning an rf bandpass filter |
AT93921740T ATE158903T1 (en) | 1992-03-31 | 1993-03-30 | METHOD FOR ADJUSTING A HF BANDPASS FILTER |
DE69314276T DE69314276T2 (en) | 1992-03-31 | 1993-03-30 | METHOD FOR SETTING AN HF BAND PASS FILTER |
NO934314A NO303958B1 (en) | 1992-03-31 | 1993-11-29 | Procedure for tuning an RF bandpass filter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI921412 | 1992-03-31 | ||
FI921412A FI91469C (en) | 1992-03-31 | 1992-03-31 | Method of tuning an RF bandpass filter |
Publications (4)
Publication Number | Publication Date |
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FI921412A0 FI921412A0 (en) | 1992-03-31 |
FI921412A FI921412A (en) | 1993-10-01 |
FI91469B FI91469B (en) | 1994-03-15 |
FI91469C true FI91469C (en) | 1994-06-27 |
Family
ID=8535010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI921412A FI91469C (en) | 1992-03-31 | 1992-03-31 | Method of tuning an RF bandpass filter |
Country Status (9)
Country | Link |
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US (1) | US5448769A (en) |
EP (1) | EP0587886B1 (en) |
JP (1) | JP3078838B2 (en) |
AT (1) | ATE158903T1 (en) |
AU (1) | AU659303B2 (en) |
DE (1) | DE69314276T2 (en) |
FI (1) | FI91469C (en) |
NO (1) | NO303958B1 (en) |
WO (1) | WO1993020616A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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US5530921A (en) * | 1995-02-09 | 1996-06-25 | Telefonaktiebolaget Lm Ericsson | Enhanced system and method for implementing a backup control channel in a cellular telecommunication network |
GB2317760B (en) * | 1996-09-27 | 2000-09-13 | Nec Technologies | Mobile telephone apparatus |
US6014554A (en) * | 1997-09-30 | 2000-01-11 | Lucent Technologies, Inc. | Method and apparatus for tuning analog filters |
FI107766B (en) * | 1998-01-28 | 2001-09-28 | Nokia Networks Oy | Reconciliation procedure and transceiver unit |
DE19844142C2 (en) * | 1998-09-25 | 2002-04-18 | Siemens Ag | Programmable RF block |
AU1261800A (en) | 1998-09-25 | 2000-04-17 | Siemens Aktiengesellschaft | Programmable mobile radiotelephone terminal |
SE0000585D0 (en) * | 2000-02-23 | 2000-02-23 | Ericsson Telefon Ab L M | Tuning method and system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3715690A (en) * | 1971-05-18 | 1973-02-06 | Trw Inc | Automatic tuning electric wave filter |
US4726071A (en) * | 1984-12-31 | 1988-02-16 | Orion Industries, Inc. | Microprocessor controlled self-tuning resonant cavity and method |
US5034707A (en) * | 1989-12-06 | 1991-07-23 | Telefonaktiebolaget Lm Ericsson | Combiner arrangement in a radio base station |
DE4012265A1 (en) * | 1990-04-17 | 1991-10-24 | Toepholm & Westermann | CIRCUIT ARRANGEMENT FOR AN OUTPUT TANK CIRCUIT OF A TRANSMITTER END STAGE OPERATED WITH FREQUENCY REVERSING |
SE467717B (en) * | 1990-12-21 | 1992-08-31 | Ericsson Telefon Ab L M | PROCEDURE FOR FINISHING THE RESONANCE FREQUENCY FOR A FILTER IN A COMBINER |
CA2059580C (en) * | 1991-01-18 | 1996-06-11 | Youhei Ishikawa | Auto-tuned apparatus for band-pass filter |
US5274672A (en) * | 1991-10-31 | 1993-12-28 | Motorola, Inc. | Optimized clock recovery for an MSK system |
-
1992
- 1992-03-31 FI FI921412A patent/FI91469C/en not_active IP Right Cessation
-
1993
- 1993-03-30 WO PCT/FI1993/000128 patent/WO1993020616A1/en active IP Right Grant
- 1993-03-30 EP EP93921740A patent/EP0587886B1/en not_active Expired - Lifetime
- 1993-03-30 AU AU37551/93A patent/AU659303B2/en not_active Ceased
- 1993-03-30 AT AT93921740T patent/ATE158903T1/en not_active IP Right Cessation
- 1993-03-30 DE DE69314276T patent/DE69314276T2/en not_active Expired - Fee Related
- 1993-03-30 US US08/150,132 patent/US5448769A/en not_active Expired - Lifetime
- 1993-03-30 JP JP05517134A patent/JP3078838B2/en not_active Expired - Lifetime
- 1993-11-29 NO NO934314A patent/NO303958B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FI91469B (en) | 1994-03-15 |
JPH06508018A (en) | 1994-09-08 |
JP3078838B2 (en) | 2000-08-21 |
FI921412A0 (en) | 1992-03-31 |
EP0587886B1 (en) | 1997-10-01 |
DE69314276D1 (en) | 1997-11-06 |
NO934314L (en) | 1993-11-29 |
NO934314D0 (en) | 1993-11-29 |
AU659303B2 (en) | 1995-05-11 |
EP0587886A1 (en) | 1994-03-23 |
NO303958B1 (en) | 1998-09-28 |
FI921412A (en) | 1993-10-01 |
US5448769A (en) | 1995-09-05 |
WO1993020616A1 (en) | 1993-10-14 |
DE69314276T2 (en) | 1998-03-12 |
ATE158903T1 (en) | 1997-10-15 |
AU3755193A (en) | 1993-11-08 |
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